JPH0222209A - Herbicidal composition - Google Patents

Abstract

PURPOSE:To obtain a herbicidal composition having synergistically increased spectrum and extremely shortened evolution of herbicidal effects by using both a tetrahydroisoindoledione derivative and an N-(phosphonomethyl)glycine. CONSTITUTION:(A) 2-[7-Fluoro-3,4-dihydro-3-oxo-4-(2-propenyl)-2H-1,4- benzoxazin-6-yl]-4,5,6,7-tetrahydro-18-indole-1,3(2H)-dione shown by formula I is blended with (B) N-(phosphonomethyl)glycine shown by formula II or a salt (glyphosate) as active ingredients in the ratio of 1 pt.wt. component A and usually 0.5-100 pts.wt., preferably 1-70 pts.wt. component B to give a herbicidal compound which is capable of controlling weeds occurring in agricultural land nonagricultural land with a smaller amount of agent compared with separative use of each component and has rapid and excellent evolution of herbicidal effects.

Description

[Detailed description of the invention] <Industrial use minute hand> The present invention relates to a novel herbicidal composition.

<Prior art and problems to be solved by the invention> Currently, many herbicides are used for agricultural and non-agricultural land, but the weeds that are targeted for control are many types and have long-term emergence. Therefore, it is desired to develop herbicides with higher herbicidal effects and a broader herbicidal spectrum.

Glyphosate is a herbicide that can be applied before planting crops or tilling, but it takes a relatively long time for weeds to completely die after application, and it takes about 10 days or more. be. If it is possible to shorten this weeding period even a little, farmers will be able to start their next agricultural work, such as planting crops or plowing, that much sooner, which will be very advantageous.

Means for Solving the Problems> As a result of various studies in order to develop a herbicide that meets these problems, the present inventors found that 2-[7-fluoro-3,4-dihydro-8
-oxo-4-(2-propynyl)-2H-1,4-benzoxazin-6-yl]-45,6,7-tetrahydro-1H-isoindole-1,3(2H)-dione (hereinafter referred to as compound (denoted as !)) and N-(phosphonomethyl)glycine or its salt represented by the formula H (hereinafter referred to as glyphosate) as active ingredients (hereinafter referred to as the composition of the present invention). )
control a wide range of weeds that occur in agricultural or non-agricultural land, and their herbicidal effects are synergistically increased compared to when they are used alone, can be applied at low dosages, and have an expanded herbicidal spectrum. Furthermore, they discovered that the onset of herbicidal effect is significantly accelerated, and completed the present invention. The herbicidal effect of the composition of the present invention shows symptoms the day after or the day after the chemical treatment, and although it varies depending on the grass species, it is usually possible to almost completely kill the grass within one week.

Weeds that can be controlled by the composition of the present invention include, for example, freckle grass, snail knotweed, snail grass, purslane, chickweed, whiteweed, stagweed, tibiae, sagebrush,
Shepherd's shepherd's shepherd's shepherd's nape, American hornwort, Ebisugusa, Ichibi, American gold deer, field pansy, Yaemura, American morning glory, Malva morning glory,
Broad-leafed weeds such as Convolvulus, Orientalis, Lamium japonica, White-breasted herb, Japanese Morning Glory, Japanese Physalis, Japanese Physalis, Japanese fir tree, Japanese poppy, sunflower, Japanese chamomile, corn marigold, mugwort, Japanese violet, etc.; , Sparrowberry, Examples include weeds of the Poaceae family, such as grasshopper, oat, oat, Seiban sorghum, grasshopper, horseweed, Japanese cypress, Cyperaceae weeds such as Asiatic dayflower, and Cyperaceae weeds such as Cyperaceae and Cyperaceae.

The compound (see JP-A-61-76486) has a herbicidal effect, and glyphosate (C, RlWort) has a herbicidal effect.
hing et al, s The Pe5tic
ide Manua 18th Ed, (1987)
p449-450) are known as herbicides. In addition, an isopropylamine salt etc. can be mentioned as a salt of N-(phosphonomethyl)glycine.

The compound that is the active ingredient of the composition of the present invention [! ] and glyphosate can be varied over a relatively wide range, but the mixing ratio of glyphosate to 111 parts by weight of a normal compound [fi parts] is 0.5 to 1001 [fi parts, preferably 1 to 70 parts by weight].
'N parts.

The composition of the present invention is usually mixed with solid carriers, surfactants, other formulation auxiliaries, etc., and formulated into wettable powders, suspensions, etc., and used.

These preparations contain 1 to 90%, preferably 2 to 80% of the active ingredients, compound [sugar and glyphosate, at the base of the preparation].

Examples of the solid carrier include fine powders or granules such as kaolin clay, attapulgite clay, bentonite, acid clay, pyrophyllite, talc, diatomaceous earth, calcite, walnut shell powder, urea, ammonium sulfate, and synthetic hydrous silicon oxide.

Surfactants used for dispersion, wet layer, etc.
Alkyl sulfate salts, alkylaryl sulfonates, dialkyl sulfosuccinic acids (salts and esters),
Anionic surfactants such as polyoxyethylene alkylaryl ether phosphate ester salts, polyoxyethylene alkyl ether, polyoxyethylene alkylaryl ether, polyoxyethylene polyoxypropylene block copolymer, sorbicun fatty acid ester, polyoxyethylene sorbitan fatty acid ester, etc. Examples include nonionic surfactants.

Other formulation adjuvants include lignin sulfonate, alginate, -rivinyl alcohol, gum arabic, CMC (carboxymethyl cellulose), PAP.
(acidic isopropyl phosphate), etc.

The formulated composition of the present invention is used, for example, by treating the foliage of weeds after they emerge.

Moreover, by mixing it with other herbicides, it is expected that the herbicidal efficacy will be further enhanced. Alternatively, it can be used in combination with insecticides, acaricides, nematicides, fungicides, plant growth regulators, and the like.

The composition of the present invention can also be used as a herbicide for fields, fallow fields, paddy fields, orchards, pastures, lawns, forests, non-agricultural lands, and the like.

The application amount of the composition of the present invention varies depending on the mixing ratio of the active ingredients, the formulation form of the drug, the type of target weed, weather conditions, etc.
Usually the total amount of active ingredients per hectare is 100-500
(l is preferably 200 to 8000 S'. Wettable powder,
Suspending agents, etc. are usually used at a prescribed amount of 100% per hectare.
- Apply diluted with 1000/ml of water. When diluting, auxiliary agents such as a spreading agent may be added as necessary. In addition to the surfactants mentioned above, such auxiliary agents include polyoxyethylene resin acid (ester), lignin sulfonate, abietin, etc. acid salt, dinaphthylmethane disulfonate, paraffin, petroleum oil
) etc.

<Examples> Next, the present invention will be explained in more detail with reference to formulation examples and test examples, but the present invention is not limited to these examples.

First, a formulation example will be shown. Note that parts represent parts by weight.

Formulation Example 1 Compound (I) 1 il, glyphosate 50X! , 8 parts of calcium ligninsulfonate, 2 parts of sodium lauryl sulfate, and 44 parts of synthetic hydrous silicon oxide are thoroughly ground and mixed to obtain a wettable powder.

Formulation Example 2 A suspension is obtained by mixing 111 parts of the compound, 20 parts of glyphosate, 8 parts of polyoxyethylene sorbitan monooleate, 8 parts of CMC, and 78 parts of water, and wet-pulverizing the mixture until the particle size becomes 5 microns or less.

Formulation Example 8 Compound (1) 25 parts, glyphosate 25 parts, calcium lignin sulfonate 8 parts, sodium lauryl sulfate 2
1 part and 45 parts of synthetic hydrated silicon oxide are thoroughly ground and mixed to obtain a hydrating powder.

Formulation Example 4 0.7 parts of compound (I), 49 parts of glyphosate, 8 parts of calcium lignin sulfonate, 2 parts of sodium lauryl sulfate, and 46.8 parts of synthetic hydrous silicon oxide are thoroughly ground and mixed to obtain a wettable powder.

Formulation Example 5 Compound (131.5 parts, glyphosate 50 parts, calcium lignin sulfonate 8 parts, sodium lauryl sulfate 2 parts)
1 part and 48.5 parts of synthetic hydrated silicon oxide are thoroughly ground and mixed to obtain a wettable powder.

Formulation Example 6 Compound (1) 0.4 parts, glyphosate 1.6 parts, polyoxyethylene sorbitan monooleate 1 part, CMC
1 part and 96 parts of water are mixed and wet-milled until the particle size is 6 microns or less to obtain a suspension.

Formulation Example 7 Compound [1] 0.4 parts, Tsurpol ■5050 (Toho Chemicals, containing 50% dialkyl sulfosuccinate) 1
After mixing 0 parts of sodium ligninsulfonate, 4 parts of synthetic hydrous silicon oxide, and 79 parts of clay, 1.6 parts of glyphosate is added, mixed, and pulverized to obtain a wettable powder.

Next, the effects of the composition of the present invention will be specifically illustrated by test examples. Note that the glyphosate used in this test is an isopropylamine salt of N-(phosphonomethyl)glycine.

Test Example 1 A concrete pot with an inner diameter of 50 cm x 50 cm and a depth of 80 cm placed outdoors was filled with upland soil (sandy loam), and the soil was filled with field soil (sandy loam). The seeds were sown and grown for 40 days. Thereafter, the test material was made into a wettable powder according to Formulation Example 1.8.4 or 5, and a predetermined amount of the wettable powder was added to 1
Spread hecta. At this time, the leaf age of each weed is 1-8 leaf stage,
The plant height was 4-8 cm. The herbicidal efficacy was investigated on the 8th and 199th day after treatment.

The evaluation criteria were expressed as numbers from 0 (no effect) to 10 (complete death). The results are shown in Tables 1 and 2.

Table 1 Table 2 Test Example 2 In order to investigate the herbicidal activity of the composition of the present invention against undergrowth naturally occurring in pear orchards, one plot was 2.8 m x 8.6 m;
Eight replicate test plots were set up.

The test material is made into a wettable powder according to Formulation Example 1.8.4 or 5, and a predetermined amount of the wettable powder is uniformly applied to the surface of the 8th plate containing 0.2% (volume) of a dialkyl sulfosuccinate-containing surfactant. Spread. At this time, the plant heights of each weed were 510 m for Japanese grasshopper, 400 m for Japanese grasshopper, and 80 m for Japanese poppy.
-40>, Oarachinogiku 5-101, Hurtade 40
70>, Aobiyu 5 1001. After 16 days of treatment, the herbicidal efficacy was reduced to 1 lif using the same method as in Test Example 1.

The results are shown in Table 8.

Test Example 8 A Wagner pot with an inner diameter of 16C and 11% and a depth of 191 cm was filled with upland soil (sandy loam), seeded with Umanochahiki, and placed outdoors for 4 hours.
It was grown for 0 days. The test material was made into a wettable powder according to Formulation Example 1.8.4 or 5, and the predetermined amount was 1 containing 0.2% (volume) of a commercially available product containing 80X polyoxyethylene dodecyl ether surfactant. It was diluted with water equivalent to 500 liters per hectare and sprayed uniformly over the entire foliage area from above the plant using a small sprayer. At this time, the growth status of Umanoteyahiki was 8 leaf stage and the plant height was about 10C11.

The herbicidal efficacy was investigated 20 days after the treatment.

In addition, the herbicidal efficacy is expressed by the growth suppression distance calculated by the following formula by measuring the fresh N hoe of the above-ground parts of the test plants that remained withered at the time of the survey.

Growth suppression Kushima- The results are shown in Table 4.

Table 4 The results in Table 4 were summarized using the isoeffect line method [Fukami order-1 Yasuhiko Uesugi, Rinzo Ishizuka, Choji Tomizawa eds. Pesticide Experimental Methods Volume 8 Herbicides Edition 1st edition pp. 109-111 (1981) ) Published by Soft Science Co., Ltd.].

The results are shown in FIG. From the figure, it is clear that the composition of the present invention has a synergistic effect.

<Effects of the Invention> The composition of the present invention is an excellent herbicidal composition that controls a wide range of weeds that occur in agricultural or non-agricultural land, and exhibits a herbicidal effect quickly.

[Brief explanation of the drawing]

FIG. 1 is a diagram drawn by the iso-effect line method based on the herbicidal efficacy against P. chinensis described in Table 4 of Test Example 8. The vertical axis represents the dose of glyphosate (P/ha), and the horizontal axis represents the dose of the compound (y/ha). rate 9
The 0% isoeffect line is shown as a solid line. \, \ Figure 1

Claims (1)

[Claims] 2-[7-fluoro-3,4-dihydro-3-oxo-
4-(2-propynyl)-2H-1,4-benzoxazin-6-yl]-4,5,6,7-tetrahydro-1
H-isoindole-1,3(2H)-dione and N-(
1. A herbicidal composition comprising phosphonomethyl)glycine or a salt thereof as an active ingredient.